JP2006132366A - Lubricating device of vertical engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a lubricating performance of engine in a vertical engine. <P>SOLUTION: An oil pan 13 storing a lubricating oil L is formed at the lower end part of a crankcase 11, and a crankshaft 14 is rotatably installed in the crankcase 11 in the vertical direction. A governor holder 52 rotatingly driven by the crankshaft 14 is rotatably installed in the crankcase 11. An oil bucket 61 picking up the lubricating oil L in the oil pan 13 and jetting upward is fitted to the governor holder 52. The oil bucket 61 comprises an inflow port 65 allowing the lubricating oil L to flow therein and a tilted surface 66 guiding the lubricating oil flowing from the inflow port 65 therein to the upper side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vertical engine lubrication device mounted on a crankcase with a crankshaft facing in the vertical direction.

  The vertical engine is a type of engine that is installed in the crankcase with the crankshaft up and down, and is also called a vertical shaft engine or vertical axis engine, and is used as a power source for mowers and lawn mowers. Has been. In such a vertical engine, the lower end portion of the crankcase is an oil pan that contains lubricating oil, and the lubricating oil in the oil pan supports the crankshaft rotatably, such as a journal portion of the crankshaft. Supplied to the sliding surface.

In order to supply the lubricating oil in the oil pan to the bearing portion that supports the lower end portion of the crankshaft in the vertical direction, Patent Document 1 discloses a lubricating oil jumper that is driven to rotate by a valve camshaft in the crankcase. A lubrication device is described which is adapted for mounting. Patent Document 2 discloses an oil dipper (oil scraper) that is driven by a crankshaft to rotate a governor's governor holder that is disposed at right angles to the crankshaft, and that is immersed in lubricating oil of an oil pan on the outer periphery of the governor holder. A lubrication device intended to be provided is described.
Japanese Utility Model Publication No. 5-32705 JP-A-8-177441 (see FIG. 5)

  However, as described in Patent Document 1, when a dedicated lubricating oil jumper is provided in the crankcase, the number of parts of the engine increases, the engine structure becomes complicated, and the manufacturing cost of the engine cannot be reduced. Further, as described in Patent Document 2, when the lubricating oil is scraped up by the oil dipper provided in the governor holder, the lubricating oil adhering to the outer peripheral surface of the governor holder is only scraped up, and the lubricating oil is sufficiently absorbed. It cannot be supplied to a desired lubricating oil demand section. In particular, in a vertical engine in which the valve operating mechanism for driving the intake / exhaust valve is an OHV type or OHC type, the combustion pressure is higher than that of a side valve type engine, so the load applied to the journal portion of the crankshaft is high. It is necessary to increase the lubrication performance of the sliding surface.

  An object of the present invention is to improve engine lubrication performance in a vertical engine.

  The vertical engine lubrication device of the present invention is an oil that rotatably supports the lower end portion of the crankshaft and accommodates lubricating oil in a crankcase in which a crankshaft driven to rotate by a piston is mounted in the vertical direction. A vertical engine lubrication device provided with a pan, which is rotatably mounted in the crankcase in parallel with the crankshaft, and is driven by the crankshaft, and the governor holder has an oil pan in the oil pan. And an oil bucket for scooping up the lubricating oil in the oil pan and ejecting it upward.

  In the lubricating device for a vertical engine according to the present invention, the oil bucket has a scooping portion in which an inflow port is provided on the front side in the rotational direction of the governor holder, and an inclined surface facing the inflow port is provided. .

  The vertical engine lubricating device of the present invention is characterized in that a plurality of the oil buckets are provided inside the governor holder.

  According to the present invention, the oil bucket provided in the governor holder scoops up the lubricating oil in the oil pan by the rotation of the governor holder and ejects it upward, so that a desired amount of lubricating oil is supplied to each lubricating oil request portion of the engine. It can be supplied efficiently. Since the oil bucket is provided in the governor holder, the lubricating oil can be supplied to each lubricating oil requesting portion with a small number of parts.

  The lubricating oil flows into the oil bucket from the inlet provided on the front side in the rotational direction by the scooping portion provided in the governor holder, and is guided by the inclined surface and ejected upward from the upper opening of the oil bucket. It is reliably supplied to the lubricating oil demanding part at the top of the chamber.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a vertical engine, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a schematic view showing an intake / exhaust system of the vertical engine shown in FIGS. FIG.

  The crankcase 11 of the vertical engine 10 has a substantially cylindrical side wall portion 12a as shown in FIG. 2, and a top wall portion 12b integrally provided on the upper portion of the side wall portion 12a as shown in FIG. A case main body 12 and an oil pan 13 attached to the lower portion of the side wall portion 12a are provided, and a crank chamber 11a is formed inside. A crankshaft 14 is mounted in the crankcase 11 so as to face in the vertical direction, that is, in the vertical direction. The upper end portion of the crankshaft 14 is supported by the top wall portion 12b via a ball bearing 15 and the lower end portion is oil pan 13. It is supported by the cylindrical part 16 provided in the. In the oil pan 13, the lubricating oil L supplied to the sliding portion of each member constituting the engine, that is, the lubricating oil requesting portion is accommodated, and the lubricating oil L leaks from between the crankshaft 14 and the oil pan 13. In order to prevent this, an oil seal 17 is attached to the oil pan 13. When this vertical engine is used as a power source for a mowing (mowing) or brush cutter, a cutting blade for mowing is connected to the lower end of the crankshaft 14 directly or via a shaft (not shown). The

  A cylinder 18 is integrally provided in the case main body 12, and a piston 20 is removably mounted in a cylinder bore 19 formed in the cylinder 18 so as to face the horizontal direction. The piston 20 is connected to a connecting rod. The crankshaft 14 is rotated by the reciprocating motion of the piston 20. A cylinder head 22 is attached to the cylinder 18, and a combustion chamber 23 is formed by the cylinder head 22 and the cylinder 18. As shown in FIG. 3, the cylinder head 22 includes an intake port 24 that supplies an air-fuel mixture to the combustion chamber 23 and an exhaust port 25 that discharges combustion exhaust gas, and an intake pipe 26 that communicates with the intake port 24. An exhaust pipe 27 communicating with the exhaust port 25 is attached to the cylinder head 22. A throttle valve 28 for adjusting the amount of air supplied from the outside to the combustion chamber 23 and a carburetor 29 for spraying fuel on the air are attached to the intake pipe 26. A spark plug 30 for igniting the air-fuel mixture in the combustion chamber 23 is attached to the cylinder head 22 as shown in FIG.

  As shown in FIG. 3, the cylinder head 22 is provided with an intake valve 31 for opening and closing the intake port 24 and an exhaust valve 32 for opening and closing the exhaust port 25, and a camshaft 34 having a valve operating cam 33 is rotatable. As shown in FIG. 2, a chain 37 is spanned between a drive-side sprocket 35 fixed to the crankshaft 14 and a driven-side sprocket 36 fixed to the camshaft 34, and the camshaft 34 is When the crankshaft 14 is driven to rotate and the crankshaft 14 rotates twice, the camshaft 34 rotates once. As shown in FIG. 3, a rocker shaft 38 provided in the cylinder head 22 includes a rocker arm 39 a that opens and closes the intake valve 31 and a rocker that opens and closes the exhaust valve 32. The arm 39b is swingably mounted. Thus, the valve mechanism for opening and closing the intake valve 31 and the exhaust valve 32 is an OHC type in which the valves 31 and 32 and the valve cam 33 are mounted on the cylinder head 22.

  As shown in FIG. 1, an engine cover 41 is attached above the crankcase 11 so as to cover it, and a cooling fan 42 fixed to the upper end of the crankshaft 14 is disposed in the engine cover 41. The cooling fan 42 generates cooling air that flows along the outer surface of the crankcase 11 by the rotation of the crankshaft 14. A recoil pulley 43 of a recoil starter for starting the engine is rotatably mounted on the engine cover 41, and a recoil rope 44 is wound around the recoil pulley 43. On the other hand, a rotating cylinder 45 is attached to the crankshaft 14, and the recoil pulley 43 is engaged with the rotating cylinder 45 when it is rotated, and the rotation of the recoil pulley 43 is transmitted to the crankshaft 14. A coupling mechanism 46 is provided. Therefore, when the operator pulls the recoil rope 44 to rotate the crankshaft 14, the crankshaft 14 can be rotated to start the engine.

  4A is a cross-sectional view taken along line BB in FIG. 2, FIG. 4B is a perspective view showing the governor holder shown in FIG. 4A, and FIG. It is sectional drawing which follows the CC line in FIG. 4 (B).

  In order to constitute the governor mechanism, as shown in FIG. 4 (A), the support base 51 provided in the oil pan 13 has a bottom wall portion 52a and a cylindrical side wall portion 52b integrated therewith. The governor holder 52 is mounted in parallel with the crankshaft 14, and a fitting hole formed in the bottom wall portion 52 a is rotatably fitted to a shaft portion 51 a provided in the support stand 51, so that the governor holder 52 is supported by the support stand 51 is freely rotatable. A driven gear 54 that meshes with a drive gear 53 fixed to the crankshaft 14 is provided on the outer peripheral surface of the side wall 52 b of the governor holder 52, and the governor holder 52 is rotationally driven by the rotation of the crankshaft 14.

  In the governor holder 52, as shown in FIG. 4A, two governor weights, that is, weights 55, are swingably attached by pins 56, respectively. As shown in FIG. 2, each weight 55 is formed by bending a sheet metal material into a U-shape, and an operating arm portion 55a is provided at the lower portion. In the governor holder 52, governor shafts 57 that come into contact with the respective operating arm portions 55a are incorporated and slidably fitted in the shaft portions 51a in the axial direction. As shown in FIG. 4A, the upper end portions are swung so as to spread each other and push the governor shaft 57 upward. As shown in FIG. 2, a governor lever 58 bent in an L shape is rotatably mounted on the crankcase 11, and the operating end of the governor lever 58 faces the governor shaft 57.

  The governor lever 58 is applied with a spring force that pushes down the governor shaft 57 in FIG. 4A by a spring member (not shown). When the engine is stopped, the governor shaft 57 is lowered as shown by a two-dot chain line. It is pushed down to the limit position. The governor lever 58 is connected to the throttle valve 28 by a link (not shown). When the engine speed is changed due to load fluctuation or the like, the governor shaft 57 is moved in the axial direction by the weight 55 and the throttle valve 28 is moved. It is driven and the engine speed is adjusted to the set speed.

  Two oil buckets 61 are provided on the inner side of the governor holder 52 with a phase difference of 180 degrees in the rotation direction thereof. Each oil bucket 61 has a guide tube 63 that forms an oil passage 62 with the side wall portion 52b. The guide tube 63 has an upper end opened in the crank chamber 11a and a lower end in the oil pan 13. It protrudes below the bottom wall portion 52a so as to enter, and the protruding portion is a scooping portion 64. In the scooping portion 64, when the rotation direction of the governor holder 52 is the direction indicated by the arrow in FIG. 4B, an inlet 65 is formed on the front side in the rotation direction. It is immersed in L. The rear side wall of the scooping portion 64 that faces the inlet 65 is an inclined surface 66 that is inclined so as to be on the rear side in the rotational direction as it goes upward. Therefore, when the governor holder 52 is rotated by the engine operation, the lubricating oil L in the oil pan 13 enters the oil passage 62 from the inlet 65 and is pushed up by the inclined surface 66 and jets upward from the upper end opening of the oil passage 62. Then, the lubricating oil L is supplied to the lubricating oil requesting part in each member constituting the engine. A part of the lubricating oil L ejected upward from the oil passage 62 is directed radially outward as shown in FIGS. 4B and 4C by the centrifugal force generated by the rotation of the governor holder 52, as shown in FIGS. Injected so as to be inclined radially.

  As shown in FIG. 4, two oil buckets 61 are provided in the governor holder 52. However, only one oil bucket 61 may be provided without providing a plurality of oil buckets 61, or three or more oil buckets 61 may be provided. Furthermore, the oil bucket 61 may be provided outside the governor holder 52.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, although the illustrated vertical engine is used as a power source for a mowing (mowing) or brush cutter, it can also be used as a power source for other devices such as a generator. When used as a power source for a generator, a power generator is attached to the lower end of the crankshaft 14.

It is a longitudinal cross-sectional view which shows a vertical engine. It is sectional drawing which follows the AA line in FIG. FIG. 3 is a schematic view showing an intake / exhaust system of the vertical engine shown in FIGS. 1 and 2. (A) is sectional drawing which follows the BB line in FIG. 2, (B) is a perspective view which shows the governor holder shown by (A), (C) is CC line in (B) FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vertical engine 11 Crankcase 13 Oil pan 14 Crankshaft 52 Governor holder 53 Drive gear 54 Driven gear 55 Weight 57 Governor shaft 58 Governor lever 61 Oil bucket 62 Oil passage 63 Guide tube 64 Scavenging part 65 Inlet 66 Inclined surface

Claims (3)

Lubricating apparatus for a vertical engine, in which a crankcase mounted with a crankshaft driven to rotate by a piston is directed vertically, and an oil pan is provided for rotatably supporting the lower end of the crankshaft and containing lubricating oil Because
A governor holder that is rotatably mounted in the crankcase in parallel with the crankshaft, and is driven by the crankshaft;
2. A vertical engine lubrication device comprising: an oil bucket provided on the governor holder so as to protrude into the oil pan and scooping up the lubricating oil in the oil pan and ejecting it upward.   2. The lubricating device for a vertical engine according to claim 1, wherein the oil bucket has a scooping portion in which an inflow port is provided on a front side in a rotation direction of the governor holder, and an inclined surface facing the inflow port is provided. A vertical engine lubrication system.   The vertical engine lubrication apparatus according to claim 1 or 2, wherein a plurality of the oil buckets are provided inside the governor holder.

Images